coverity#1266461 Improper use of negative value
coverity#1266461 Improper use of negative value

Change-Id: I4f78617129de21f7088d6f0d8b781674faa6b45a

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core